Based on this product's specifications, here are some alternatives and similar models
Laptop battery t6 power for Lenovo B40-30 B40-70 B50-30 N40-30 N50-30 N50-70 E50-80 2600mAh 38Wh
Summary description:
Replacement laptop battery by t6 power compatible with Lenovo models B40-30, B40-70, B50-30, N40-30, N50-30, N50-70 and E50-80. Rated 2600mAh (38Wh), it provides portable power for everyday use and light mobile computing tasks. Designed for easy installation to restore battery life in compatible Lenovo notebooks and extend run time between charges.